Valveless oil pump



E. L. MLLER.

VALVELESS 0H. PUMP.

NPPLVxcATloN FILED JULY 16. 1920.

` Patented Mar. 7, 1922. l

2 SHEETS-SHEET1.

1b 12 g 5 :III- 22 2 3 Jnyentor: www@ "f wlw/My.

E. L. MLLER.

VALVELESS OIL PUMP.

APPLICATION FILED IuLY I6, 1920.

UNITE EUGEN L. MLLER, or BERLIN, GERMANY.

VALVELESS (EL PUMP.

Application led July i6,

To all t0/0m t 'may concern:

Be it known that I, EUGEN LUDWIG ML- LER, a citizen of the German Empire, residing at Berlin, Germany, have invented certain new and useful mprovements in Valveless Oil Pumps, of which the following is a specification.

My invention refers to pumps and more especially to a valveless oil pump with a rotating distribution block and a piston supplying several pressure pipes.

In the drawings aflixed to this specification and forming part thereof two modifications of a pump embodying my invention are illustrated -by way of example.

In the drawingsy Fig. l is a longitudinal section,

Fig. 2 a section following the line II-II in Flg. l,

Fig. 3 a section following III-III in Fig. l

ing. i a section following rviv in Fig. l.

Fig. 5 is a longitudinal section of a pump, the pressing action of which is preceded by the action of a controlling pump of smaller volume.

Fig. 6 is a section following the line lli-JI in Fig. 5.

l is the casing, 2 the block inserted therein and containing the piston; this piece will henceforward be called the distribution block; 3 is the piston, l the worm .gear driving the distribution block.

Attached to this block 2 is the cam disk 5 commanding the pressure action, while the cam guide commanding the suction is attached to another piece 8 arranged above the piston and connected with the pressure cam disk by a case 9.

When piston 3 is lifted, the liquid pours into the ascending hole 2l of the rotating distribution block through opening 18, chamber 19 and the suction holes 2O of the casing. Then piston 3 is pushed down, the liquid contained in hole 2l is pressed into the pressure holes arranged in a different plane. By this arrangement no air pockets can remain inside the clearance and a minimum clearance is obtained.

Figs. 5 and 6 illustrate a duplex pump constructed on similar lines.

Specification of Letters Patent.

Patented Mar. '7, 1922.

1920. Serial No. 396,873.

For reasons of supervision of the play those kinds of duplex pumps have proved best by which they oil is pumped into an intermediate tank by a control pump; from this tank another pump-the pressure pump -drives the oil to its destination. As two pumps of exactly equal size cannot possibly be manufactured, the pressure pump must be made slightly larger than the control pump for safetys sake so as to make sure that it throws out all the oil lifted by the control pump. For this reason the pressure pump invariably sucks in a small percentage of air which, if jammed in the clearance, interferes with the work of the pump. From this follows the importance of making the channel especially of the pressure pump ascend, as by doing so the mixture of oil and air is driven to the destination; only thus can it be made sure that the air sucked in is driven out again without collecting in the clearance.

Furthermore the invention consists in the arrangement of a combined piston 3 provided with different diameters for the control and the pressure pump. Thus absolute safety is obtained about the influence of the difference of the output of both pumps, as by this scheme the strokes are identical and the piston diameters can easily be machined down to exact measure.

ln the duplex pump shown in Figs. 5 and 6 the narrow bottom part of the graduated piston 3 serves as the piston of the pressure pump and the annular face at the bottom of the wide part as the piston of the control pump. The latter sucks oil from the adjoining pipe Li0 into an annular suction channel 41 and pumps it through the suction holes 42 and the ascending channel 48 of the distribution block to the pressure holes 43. From these the oil trickles down into the intermediate tanks 44C and from these through the channels l5 into the suction holes of the pressure pump, from which it is driven through the ascending channel 49 to the pressure pipe connection 47.

I claim:

l. In a pump in combination, a pump casing, a cylindrical distributing block adapted to rotate Within said casing, a piston adapted to reciprocate in a boring in said block ing` in said block and suction and-pressure ports in said casing, the clearances of both the Pumps thus formed continually ascendl0 inoiin oblique direction. i

n testimony Wliereo- I alli); my signature.

wenn L. ivrLLni-z. 

